```typescript index.ts
import { ShipEngine } from 'ship-engine-typescript-sdk';

const shipEngine = new ShipEngine({
    /*
     * To authenticate yourself to ShipEngine, you need to include an `API-Key` header in each API call. If you don't include a key when making an API request, or if you use an incorrect or expired key, then ShipEngine will respond with a `401 Unauthorized` error.
     * 
     * Learn more about API keys in our [authentication guide](https://www.shipengine.com/docs/auth/).
     * 
     */
    apiKey: "API_KEY"
})
```